Separating and recycling method for papermaking pulp sludge

Abstract

The invention relates to a separating and recycling method for papermaking pulp sludge, and belongs to the technical field of papermaking. The method comprises the following steps: controlling a concentration of papermaking white water; adjusting and controlling a source of the sludge: performing primary filtration on the sludge through a pulping concentration inclined mesh and a filter nylon mesh, then allowing the sludge to pass through a large inclined mesh nylon mesh to flow to a sewage primary-sedimentation tank, wherein a mesh surface area of the pulping concentration inclined mesh is enlarged, the mesh surface area is enlarged by 33%, a mesh number of the filter nylon mesh is increased, the mesh number is increased by 66%, and a mesh number of the large inclined mesh nylon mesh is increased, and the mesh number is increased by 50%; and performing recycling on the sludge subjected to separation. The method provided by the invention has the following beneficial effects: the high-mesh multi-stage filter screen effectively reduces a concentration of wastewater; in the concentration control system of treating the white water by a paper machine, a type of a forming net is changed,a ternary retention aid and a dry strength agent are adopted, so that a retention rate of fine fibers and fillers is greatly improved, and difficulty of post-treatment of the wastewater is reduced; and an industrial water recycling system for papermaking pulping is ungraded.

Description

technical field [0001] The invention belongs to the technical field of papermaking, and in particular relates to a method for separating and recycling papermaking pulp sludge. Background technique [0002] In recent years, due to the reuse of OCC waste paper, the fine fibers and fillers in the waste paper have increased, resulting in a high concentration of pulping and papermaking wastewater, and a large amount of sludge will be generated when the wastewater passes through the sewage primary sedimentation tank. Papermaking sludge is actually fine fibers and fillers in papermaking wastewater. The current treatment methods for papermaking sludge include: 1. Press filter treatment. The pulp discharged from the sludge workshop has a high fiber content. Add appropriate amount of polyacrylamide to achieve a better dehydration effect, and then carry out subsequent treatment; 2. Biochemical treatment, add appropriate amount of polyaluminum chloride, ferric chloride, etc. to the slud...

AI Technical Summary

Problems solved by technology

[0003] Recently, with the popularization and application of surface rubber technology, cornstarch, tapioca starch, synthetic starch, etc. have been used in large quantities, resulting in a significant increase in waste OCC fillers in the country, and a significant increase in the concentration of papermaking wastewater. Although papermaking companies are trying to reuse sludge for In papermaking, it is difficult to control many factors such as the amount of sludge generated, mildew, blackening and odor, etc., which directly leads to the recycling and seriously affects the speed of the paper machine and the quality of the finished paper. Many enterprises have failed to achieve 100% recycling. especially activated sludge